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      Question

      What will come in place of the question mark (?) in the

      following series? 11, 13, 19, ?, 51, 81
      A 12 Correct Answer Incorrect Answer
      B 79 Correct Answer Incorrect Answer
      C 29 Correct Answer Incorrect Answer
      D 31 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, 11 + (12 + 1) = 13 13 + (22 + 2) = 19 19 + (32 + 3) = 31 31 + (42 + 4) = 51 51 + (52 + 5) = 81

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